Recent studies have shown that direct interspecies electron transfer (DIET) plays an important part in contributing to methane production from anaerobic digestion. However, so far anaerobic digestion models that have been proposed only consider two pathways for methane production, namely, acetoclastic methanogenesis and hydrogenotrophic methanogenesis, via indirect interspecies hydrogen transfer, which lacks an effective way for incorporating DIET into this paradigm. In this work, a new mathematical model is specifically developed to describe DIET process in anaerobic digestion through introducing extracellular electron transfer as a new pathway for methane production, taking anaerobic transformation of ethanol to methane as an example. The developed model was able to successfully predict experimental data on methane dynamics under different experimental conditions, supporting the validity of the developed model. Modeling predictions clearly demonstrated that DIET plays an important role in contributing to overall methane production (up to 33 %) and conductive material (i.e., carbon cloth) addition would significantly promote DIET through increasing ethanol conversion rate and methane production rate. The model developed in this work will potentially enhance our current understanding on syntrophic metabolism via DIET.

en_US

dc.language

eng

en_US

dc.publisher

Springer Verlag

en_US

dc.relation.ispartof

Environmental Science and Pollution Research

en_US

dc.relation.isbasedon

10.1007/s11356-016-7776-9

en_US

dc.subject.classification

Environmental Sciences

en_US

dc.subject.mesh

Anaerobiosis

en_US

dc.subject.mesh

Carbon

en_US

dc.subject.mesh

Electron Transport

en_US

dc.subject.mesh

Ethanol

en_US

dc.subject.mesh

Geobacter

en_US

dc.subject.mesh

Hydrogen

en_US

dc.subject.mesh

Methane

en_US

dc.subject.mesh

Methanosarcina

en_US

dc.subject.mesh

Models, Theoretical

en_US

dc.subject.mesh

Species Specificity

en_US

dc.title

A modeling approach to direct interspecies electron transfer process in anaerobic transformation of ethanol to methane.

en_US

dc.type

Journal Article

utslib.description.version

Published

en_US

utslib.citation.volume

1

en_US

utslib.citation.volume

24

en_US

utslib.location.activity

Germany

en_US

utslib.for

03 Chemical Sciences

en_US

utslib.for

05 Environmental Sciences

en_US

utslib.for

06 Biological Sciences

en_US

pubs.embargo.period

Not known

en_US

pubs.organisational-group

/University of Technology Sydney

pubs.organisational-group

/University of Technology Sydney/Faculty of Engineering and Information Technology

pubs.organisational-group

/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering

pubs.organisational-group

/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment

Recent studies have shown that direct interspecies electron transfer (DIET) plays an important part in contributing to methane production from anaerobic digestion. However, so far anaerobic digestion models that have been proposed only consider two pathways for methane production, namely, acetoclastic methanogenesis and hydrogenotrophic methanogenesis, via indirect interspecies hydrogen transfer, which lacks an effective way for incorporating DIET into this paradigm. In this work, a new mathematical model is specifically developed to describe DIET process in anaerobic digestion through introducing extracellular electron transfer as a new pathway for methane production, taking anaerobic transformation of ethanol to methane as an example. The developed model was able to successfully predict experimental data on methane dynamics under different experimental conditions, supporting the validity of the developed model. Modeling predictions clearly demonstrated that DIET plays an important role in contributing to overall methane production (up to 33 %) and conductive material (i.e., carbon cloth) addition would significantly promote DIET through increasing ethanol conversion rate and methane production rate. The model developed in this work will potentially enhance our current understanding on syntrophic metabolism via DIET.

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